
Learning on graphs (LoG) has been widely used in the applications with graph-structured data [1]}, [2]}. Node classification, as one of the most crucial tasks in LoG, asks to predict the labels of nodes in a graph, which has been used in many applications such as community detection [3]}, [4]}, [5]}, [6]}, anomaly detection [7]}, [8]}, biological pathway analysis [9]}, [10]} and so on.
